Banks



(No Model.)

0. M. FAIRBANKS.

MACHINE FOR CUTTING FILES.

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UNITED STATES PATENT OFFICE.

CRAWFORD M. FAIRBANKS, OF LINCOLN, RHODE ISLAND.

MACHINE FOR CUTTING FILES.

SPECIFICATION forming part of Letters Patent No. 380,751, dated April 10, 1888.

Application filed December 13, 1887. Serial No. 257,743. (No model.)

To all whom it may concern:

Be it known that I, CRAWFORD M. FAIR- BANKS,Of Lincoln, in the State ofRhode Island, have made certain new and useful Improvements in Machines for Cutting the Edges of Flat Files; and I do hereby declare that the following specification, taken in connection with the drawings and making a part of the same, is a full, clear, and exact description thereof.

Figure 1 is an elevation of myimproved ma chine. Fig. 2 is a transverse section of frame and file-carriage and adjusting devices.

The object of my invention is to increase the rapidity and facility with which files may be made by machinery; and it consists inthe devices for adjustingthe filecarriage, as hereinafter described.

In the drawings, A is the frame of the machine, supported by a suitable standard, B.

O is the cuttingtool, secured to an arm, D, which is pivoted to the frame and operated by a cam, E, and spring F. The movement ofthe arm D causes the tool to strike the fileblank secured beneath. I

G is the file'blank, secured to a carriage, H.

Motion is imparted to the carriage H by a screw-arbor, I, working through a nut, J, pivoted to the carriage.

The file-blank G is placed against a vertical shoulder, K, and held in position by the usual clamping device or by any other desired means. L is a vertical set-screw operating in a suitable bearing, M, attached to the frame by a balljoint, with a tail-piece or follower, N, having upon its concave surface a spline, O, sliding in a longitudinal groove, P, in the side of the carriage H.

In the operation of machines of this class it is frequently found that the cutting-tool is not striking squarely, but is cut-ting the teeth deeper upon one side of the blank than the other.

In the machine herein described the necessary adjustment of the carriage can be readily secured by raising or depressing, as the case may require, the set screw L, which will bring the carriage to any desired angle or degree of tip that may be desired.

WhatI claim as my invention, and desire to secure by Letters Patent, is-

The combination of the screw L,with its tailpiece N, having a spline, O, with the carriage H, having a longitudinal groove, P, the whole arranged and operating in the manner substantiall y as described.

CRAWFORD M. FAIRBANKS.

Witnesses:

DANL. L. D. GRANGER, (J. PERRY WHITE. 

